Sorry for my spam of mails, I want to separate my questions
by topic so they will be searchable.

I haven’t found a way to print a file to stdout with either
execline nor s6-portable-utils. The `s6-cat` utility only
echoes stuff that is already coming from stdin,
and unlike the shell, execline doesn’t have `<`.
Maybe some kind of output utility might be nice?
The Lisp dialect Clojure has `slurp` and `spit`:
https://clojuredocs.org/clojure.core/slurphttps://clojuredocs.org/clojure.core/spit
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